# 7-4 汉诺塔【函数】
def hrt():
    def move(n, a, b, c):
        if n == 1:
            print(a, "-->", c)
        else:
            move(n-1, a, c, b)
            print(a, "-->", c)
            move(n-1, b, a, c)

    n = int(input())
    a, b, c = input().split()
    move(n, a, b, c)
hrt()